Piezoelectric resonator and drive device

A drive device comprising:

• a driven part;
• and
• a piezoelectric resonator configured to drive the driven part, wherein
• the piezoelectric resonator includes
• a vibrating part having a pair of principal surfaces in an obverse-reverse relationship, and a side surface configured to couple the pair of principal surfaces to each other, and
• a protruding part which is provided to the vibrating part, and is configured to transmit a drive force generated by a vibration of the vibrating part to a driven part,
• the vibrating part has a pair of vibrating plates including a first vibrating plate and a second vibrating plate stacked on one another in a first direction in which the pair of principal surfaces are arranged side by side,
• the first vibrating plate has a flexural vibrating piezoelectric element configured to flexurally vibrate the vibrating part in a third direction perpendicular to a second direction in which the driven part and the protruding part are arranged side by side in a plan view of the principal surfaces,
• either one or both of the first vibrating plate and the second vibrating plate have a stretching vibrating piezoelectric element configured to make the vibrating part perform a stretching vibration in the second direction, and
• the side surface is provided with a plurality of terminals electrically coupled to the flexural vibrating piezoelectric element and the stretching vibrating piezoelectric element.